A 5-micron-bright spot on Titan: evidence for surface diversity     

Barnes JW  Brown RH  Turtle EP  McEwen AS  Lorenz RD  Janssen M  Schaller EL  Brown ME  Buratti BJ  Sotin C  Griffith C  Clark R  Perry J  Fussner S  Barbara J  West R  Elachi C  Bouchez AH  Roe HG  Baines KH  Bellucci G  Bibring JP  Capaccioni F  Cerroni P  Combes M  Coradini A  Cruikshank DP  Drossart P  Formisano V  Jaumann R  Langevin Y  Matson DL  McCord TB  Nicholson PD  Sicardy B 《Science (New York, N.Y.)》2005,310(5745):92-95

Observations from the Cassini Visual and Infrared Mapping Spectrometer show an anomalously bright spot on Titan located at 80 degrees W and 20 degrees S. This area is bright in reflected light at all observed wavelengths, but is most noticeable at 5 microns. The spot is associated with a surface albedo feature identified in images taken by the Cassini Imaging Science Subsystem. We discuss various hypotheses about the source of the spot, reaching the conclusion that the spot is probably due to variation in surface composition, perhaps associated with recent geophysical phenomena.  相似文献   

Detection of a Compact Radio Source near the Center of a Gravitational Lens: Quasar Image or Galactic Core?     

Gorenstein MV  Shapiro II  Cohen NL  Corey BE  Falco EE  Marcaide JM  Rogers AE  Whitney AR  Porcas RW  Preston RA  Rius A 《Science (New York, N.Y.)》1983,219(4580):54-56

By use of a new, very sensitive interferometric system, a faint, compact radio source has been detected near the center of the galaxy that acts as the main part of a gravitational lens. This lens forms two previously discovered images of the quasar Q09S7+561, which lies in the direction of the constellation Ursa Major. The newly detected source has a core smaller than 0.002 arc second in diameter with a flux density of 0.6 +/- 0.1 millijansky at the 13-centimeter wavelength of the radio observations. This source could be the predicted third image of the transparent gravitational lens, the central core of the galaxy, or some combination of the two. It is not yet possible to choose reliably between these alternatives.  相似文献   

PCR detection ofclavibacter michiganensis subsp.sepedonicus- infected tuber samples in a plate capture assay     

Debra Baer  Emily Mitzel  Julie Pasche  Neil C. Gudmestad 《American Journal of Potato Research》2001,78(4):269-277

The speed and sensitivity of PCR-based assays allow shorter turnaround times for the detection of pathogens for which culture and serological methods are difficult or unavailable. PCR was performed with primer sets Cms50 and Cms72, designed previously by Millset al. (1997) through subtractive hybridization to detectClavibacter michiganensis subspeciessepedonicus (Cms). In bacterial suspensions, fewer than three cells/10 ul reaction were detected after PCR amplicons were hybridized with specific DIG-labeled DNA probes in an enzyme-linked oligonucleosorbent assay (ELOSA). In naturally infected tuber samples representing three cultivars of potato, the diagnostic sensitivity of PCR/ ELOSA was 96%, while the specificity exceeded 99%. PCR/ELOSA detectedCms in infected tuber samples with equal sensitivity regardless of colony morphology, potato cultivar, or primer sets.  相似文献   

Molecular epidemiology of Cryptosporidium subtypes in cattle in England   总被引：1，自引：0，他引：1  

Brook EJ  Anthony Hart C  French NP  Christley RM 《Veterinary journal (London, England : 1997)》2009,179(3):378-382

Samples of Cryptosporidium spp., collected in a cross-sectional study of calves (median age 26 days) from 41 farms in Cheshire, UK, underwent molecular typing. The aim was to determine naturally occurring species/genotypes and to investigate transmission pathways within a local area. Of 60 positive samples, 54 were sequenced at an 18S rRNA locus and 51 were typed at a GP60 locus. C. parvum was identified in 50 samples, three cases were C. bovis and one was Cryptosporidium deer-like genotype. Six GP60 subgenotypes were identified. One subgenotype (IIaA15G2R1) was highly prevalent throughout the study area. A single subgenotype was identified on 20/22 farms. Two subgenotypes were found on 2/22 farms. The spatial scan statistic detected a cluster of subgenotype IIaA15G2R1 comprising seven farms. This suggests local transmission of the parasite between farms. As most of the isolates detected were the potentially zoonotic C. parvum allele IIa, intervention strategies should be considered to reduce the threat to public health. Biosecurity measures may reduce transmission between farms and result in lower levels of environmental contamination.  相似文献   

Bilateral laparoscopic subtotal perinephric pseudocyst resection in a cat     

Emily E. Mouat  Philipp D. Mayhew  Jennifer L. Weh  Peter S. Chapman 《Journal of Feline Medicine and Surgery》2009,11(12):1015-1018

  相似文献   

Seasonal food insecurity and perceived social support in rural Tanzania     

Hadley C  Mulder MB  Fitzherbert E 《Public health nutrition》2007,10(6):544-551

OBJECTIVES: To examine whether the occurrence of seasonal food insecurity was related to ethnicity, household wealth and perceived social support, and to assess whether social support was more efficacious in protecting against food insecurity in wealthier households. Secondary objectives were to assess the association between past food insecurity, current dietary intake and perceived health. DESIGN, SETTING AND SUBJECTS: A sample of 208 randomly selected mothers from two ethnic groups living in the same villages in rural Tanzania participated in a cross-sectional survey. RESULTS: Food insecurity was highly prevalent in this area, particularly among the poorer ethnic group. Half of ethnically Sukuma households fell into the most food-secure category, compared with only 20% of ethnically Pimbwe households. Among both groups, measures of household wealth and social support were strongly associated with food security. Interestingly, social support appeared to be more effective among the wealthier ethnic group/community. Past food insecurity was also related to current indicators of dietary intake and women's self-perceptions of health. CONCLUSION: Greater social support is associated with food security, suggesting that it may protect against the occurrence of seasonal food insecurity. Social support also interacts with wealth to offer greater protection against food insecurity, suggesting that increasing wealth at the community level may influence food insecurity through both direct and indirect means. Seasonal food insecurity also appears to have lasting effects that likely create and reinforce poverty.  相似文献   

Development of gates to measure the immature platelet fraction in C57BL/6J mice using the Sysmex XN-V series multispecies hematology analyzer     

Patricia Davenport  Viola Lorenz  Zhi-Jian Liu  Henry A. Feldman  Jorge Canas  Emily Nolton  Chiara-Aiyleen Badur  Thi Minh-Thi Do  Martha Sola-Visner 《Journal of veterinary diagnostic investigation》2021,33(5):913

The immature platelet fraction (IPF) is a measure of newly released platelets, which has been used as a marker of platelet production in multiple human studies but is not widely available in multispecies analyzers. We developed gates to measure the IPF in diluted and undiluted murine blood samples on the Sysmex XN-1000V multispecies hematology analyzer. IPF gates were created using undiluted and diluted (1/10) blood samples obtained from adult and newborn (postnatal day 10, P10) C57BL/6J wild-type (WT) mice, and from 3 murine models of thrombocytopenia: c-MPL^−/− mice, which lack the thrombopoietin receptor (hyporegenerative); antibody-mediated thrombocytopenia; and acute inflammation-induced thrombocytopenia. P10 mice were chosen because, at their size, we could consistently obtain (by terminal phlebotomy) the blood volume needed to run an undiluted sample. The undiluted blood IPF gate successfully differentiated between mechanisms of thrombocytopenia in both adult and P10 mice. For diluted samples, 2 IPF gates were generated: a thrombocytopenic (T) gate, which performed well in samples with platelet counts (PCs) <800 × 10⁹/L in adult mice and <500 × 10⁹/L in newborn mice, and a non-thrombocytopenic (NT) gate, which performed well in samples with PCs above these thresholds. PCs and IPFs measured in diluted blood using these gates agreed well with those measured in undiluted blood and had good reproducibility. These diluted gates allow for the accurate measurement of PCs and IPFs in small (10 µL) blood volumes, which can be obtained easily from adult and newborn mice as small as P1 to assess platelet production serially.  相似文献   

Something old,something new: Historical perspectives provide lessons for blue growth agendas     

Bryony A. Caswell  Emily S. Klein  Heidi K. Alleway  Johnathan E. Ball  Julin Botero  Massimiliano Cardinale  Margit Eero  Georg H. Engelhard  Tomaso Fortibuoni  Ana‐Judith Giraldo  Jonas Hentati‐Sundberg  Peter Jones  John N. Kittinger  Gesche Krause  Dmitry L. Lajus  Julia Lajus  Sally C.Y. Lau  Ann‐Katrien Lescrauwaet  Brian R. MacKenzie  Matthew McKenzie  Henn Ojaveer  John M. Pandolfi  Sa&#x;a Raicevich  Bayden D. Russell  Andreas Sundelf  Robert B. Thorpe  Philine S.E. zu Ermgassen  Ruth H. Thurstan 《Fish and Fisheries》2020,21(4):774-796

The concept of “blue growth,” which aims to promote the growth of ocean economies while holistically managing marine socioecological systems, is emerging within national and international marine policy. The concept is often promoted as being novel; however, we show that historical analogies exist that can provide insights for contemporary planning and implementation of blue growth. Using a case‐study approach based on expert knowledge, we identified 20 historical fisheries or aquaculture examples from 13 countries, spanning the last 40–800 years, that we contend embody blue growth concepts. This is the first time, to our knowledge, that blue growth has been investigated across such broad spatial and temporal scales. The past societies managed to balance exploitation with equitable access, ecological integrity and/or economic growth for varying periods of time. Four main trajectories existed that led to the success or failure of blue growth. Success was linked to equitable rather than open access, innovation and management that was responsive, holistic and based on scientific knowledge and monitoring. The inability to achieve or maintain blue growth resulted from failures to address limits to industry growth and/or anticipate the impacts of adverse extrinsic events and drivers (e.g. changes in international markets, war), the prioritization of short‐term gains over long‐term sustainability, and loss of supporting systems. Fourteen cross‐cutting lessons and 10 recommendations were derived that can improve understanding and implementation of blue growth. Despite the contemporary literature broadly supporting our findings, these recommendations are not adequately addressed by agendas seeking to realize blue growth.  相似文献   

Opportunities for agent‐based modelling in human dimensions of fisheries     

Matthew G. Burgess  Ernesto Carrella  Michael Drexler  Robert L. Axtell  Richard M. Bailey  James R. Watson  Reniel B. Cabral  Michaela Clemence  Christopher Costello  Chris Dorsett  Steven D. Gaines  Emily S. Klein  Philipp Koralus  George Leonard  Simon A. Levin  Lorne Richard Little  John Lynham  Jens Koed Madsen  Andreas Merkl  Brandon Owashi  Steven E. Saul  Ingrid E. van Putten  Sharon Wilcox 《Fish and Fisheries》2020,21(3):570-587

Models of human dimensions of fisheries are important to understanding and predicting how fishing industries respond to changes in marine ecosystems and management institutions. Advances in computation have made it possible to construct agent‐based models (ABMs)—which explicitly describe the behaviour of individual people, firms or vessels in order to understand and predict their aggregate behaviours. ABMs are widely used for both academic and applied purposes in many settings including finance, urban planning and the military, but are not yet mainstream in fisheries science and management, despite a growing literature. ABMs are well suited to understanding emergent consequences of fisher interactions, heterogeneity and bounded rationality, especially in complex ecological, social and institutional contexts. For these reasons, we argue that ABMs of human behaviour can contribute significantly to human dimensions of fisheries in three areas: (a) understanding interactions between multiple management institutions; (b) incorporating cognitive and behavioural sciences into fisheries science and practice; and (c) understanding and projecting the social consequences of management institutions. We provide simple examples illustrating the potential for ABMs in each of these areas, using conceptual (“toy”) versions of the POSEIDON model. We argue that salient strategic advances in these areas could pave the way for increased tactical use of ABMs in fishery management settings. We review common ABM development and application challenges, with the aim of providing guidance to beginning ABM developers and users studying human dimensions of fisheries.  相似文献   

Diasporic Chinese voluntary associations engage China's rise     

Ningning Chen  Ying Ruo Show  Emily Hertzman 《Asia Pacific viewpoint》2023,64(3):294-303

Since the late 1970s, China has gradually risen as a global power, which culminates in the present moment when large-scale geopolitical and economic ventures such as the Belt and Road Initiative have generated diversified cross-border connections. This is most forcefully felt in the Chinese diaspora, and particularly those in Southeast Asia since the region is home to the largest and most diverse diasporic Chinese population. Chinese voluntary associations (CVAs), as crucial social institutions in the Chinese diaspora, are actively engaging with China's rise and responding to the (trans) regional political-economic and socio-cultural changes. In this introduction of the special section, we open up a collection of five research articles and one commentary that discuss the ambivalences and tensions in CVAs’ engagement with China's rise. We conceptualize CVAs as ever-evolving ancestral communities which actively (re)position themselves in relation to complex configurations of power dynamics taking place between actors in China and the Chinese diaspora. Ancestral communities evolve through a constant mediation of the two mutually-constitutive processes of transnationalization and localization, which take on dual-facing and double-embedded orientations. This special section also highlights the continuing significance and renewed engagement of CVAs and potential tensions and conflicts generated in changing geopolitical and domestic environment.  相似文献